Synthesis of nitrogen-doped carbon microtubes for application in lithium batteries

Huang, Xiaoxiao; Zhang, R.; Zhang, X.; Wen, Guangwu; Yu, Hongtao; Zhou, Yu

doi:10.1016/j.scriptamat.2012.09.003

Cited by 14 publications

(7 citation statements)

References 21 publications

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“…This phenomenon is very common for most porous carbonaceous materials with high specific surface areas 3. 26, 28 The cycling performances of A‐NCFs‐2 and A‐NCFs‐6 were also examined at a current density of 0.3 A g −1 (Figure S4 c in the Supporting Information). Thus, A‐NCFs‐2 and A‐NCFs‐6 have capacities of 493.6 and 345.1 mA h g −1 after 50 cycles, respectively; these are far lower than that of A‐NCFs‐4, although the A‐NCFs‐2 sample has a higher nitrogen content.…”

Section: Resultssupporting

confidence: 75%

“…To gain insight into the Li + insertion/extraction processes of the A‐NCFs‐4 electrode, cyclic voltammetry (CV) measurements were performed at a scan rate of 0.5 mV s −1 over the voltage range of 0.01–3 V. As seen from Figure 7 a, a clear reduction peak at about 0.5 V (versus Li/Li + ) was observed in the first cycle; this could be attributed to the formation of SEI film on the surface of the carbon electrode owing to some irreversible reactions,26, 28 which was consistent with the behavior of the charge/discharge profiles. Notably, the reduction peak in the first cycle completely disappeared from the second cycle, which indicated the exceptionally stable SEI film and ensured the good stability of the A‐NCFs‐4 electrode for insertion/extraction.…”

Section: Resultsmentioning

confidence: 97%

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Electron Transport through Early Exponential‐Phase Anode‐Grown Geobacter sulfurreducens Biofilms

et al. 2014

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Geobacter sulfurreducens biofilms were grown to early exponential phase (i.e. the point at which the catalytic current first begins to increase) on interdigitated microelectrode arrays (IDAs), resulting in the formation of sparse cell clusters surrounded by extracellular polymeric substance (EPS). Continuous domains of EPS (defined here to include extracellular materials including filaments), but not cell clusters, were observed to bridge the gaps between adjacent electrode bands. Electrochemical gate measurements revealed electrical continuity between adjacent IDA electrode bands, indicating that extracellular electron transport (EET) occurs through the EPS. The dependency of the source‐drain current on the gate potential is peak shaped, which is consistent with EPS acting as a redox conductor. The gate potential at which the maximum source‐drain current occurs is approximately 0.13 V more positive than that for stationary‐phase biofilms, indicating that redox cofactors involved in EET at the early exponential phase are different to those at the stationary phase.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 97%

Electron Transport through Early Exponential‐Phase Anode‐Grown Geobacter sulfurreducens Biofilms

et al. 2014

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“…[115,116] Recent work has shown that N-doped CNT electrodes normally display higherr eversible capacity and rate capability than raw CNT anodes. [111,115,[117][118][119] Thei mprovedp erformance can be attributed to structural defects that enhanceL i-ion absorption and ion diffusion. To be more specific,i ti ss uggested that the Ndoping process generates ad isordered carbon structurew ith extrinsicd efects, and this enhances the Li-intercalation properties.…”

Section: Carbon Nanotubes As Anode Materialsmentioning

confidence: 99%

Carbon‐Based Materials for Lithium‐Ion Batteries, Electrochemical Capacitors, and Their Hybrid Devices

2015

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A rapidly developing market for portable electronic devices and hybrid electrical vehicles requires an urgent supply of mature energy-storage systems. As a result, lithium-ion batteries and electrochemical capacitors have lately attracted broad attention. Nevertheless, it is well known that both devices have their own drawbacks. With the fast development of nanoscience and nanotechnology, various structures and materials have been proposed to overcome the deficiencies of both devices to improve their electrochemical performance further. In this Review, electrochemical storage mechanisms based on carbon materials for both lithium-ion batteries and electrochemical capacitors are introduced. Non-faradic processes (electric double-layer capacitance) and faradic reactions (pseudocapacitance and intercalation) are generally explained. Electrochemical performance based on different types of electrolytes is briefly reviewed. Furthermore, impedance behavior based on Nyquist plots is discussed. We demonstrate the influence of cell conductivity, electrode/electrolyte interface, and ion diffusion on impedance performance. We illustrate that relaxation time, which is closely related to ion diffusion, can be extracted from Nyquist plots and compared between lithium-ion batteries and electrochemical capacitors. Finally, recent progress in the design of anodes for lithium-ion batteries, electrochemical capacitors, and their hybrid devices based on carbonaceous materials are reviewed. Challenges and future perspectives are further discussed.

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“…[1][2][3][4] The effects of nitrogen doping can be seen in the enhanced capacitive behavior of N -doped carbon materials used in supercapacitors or lithium ion batteries. [4][5][6][7][8][9][10][11][12][13][14] It has been also demonstrated that nitrogen doped carbon can act as the effective metal-free catalysts for oxygen reduction reaction (ORR) of fuel cell due to the electron donor states of nitrogen species. [15][16][17][18] The unique ORR catalytic properties of nitrogen-doped carbon materials were also utilized for the air-electrodes of metal-air cells, which have a much higher specific energy density than LIB electrodes.…”

Section: Introductionmentioning

confidence: 99%

Unusual increase in the electric double-layer capacitance with charge–discharge cycles of nitrogen doped single-walled carbon nanotubes

Jiang¹,

Al-zubaidi²,

Kawasaki³

2014

Mat Express

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Nitrogen-doping treatments using cyanamide as a nitrogen source have been done for several kinds of singlewalled carbon nanotubes (SWCNTs). For SWCNT samples produced by chemical vapor deposition, N 1s X-ray photoelectron spectroscopy peaks can be observed, and the atomic nitrogen doping percentage is estimated to be 1.8 at.%. It was found that the electric double-layer capacitance of the nitrogen-doped SWCNT sample is much larger than that of the pristine sample. Furthermore, the doped sample shows a better rate performance due to its smaller electric resistance. It should also be noted that the capacitance of the nitrogen-doped SWCNTs increases with charge-discharge cycles. This unusual increase is discussed based on the results of XPS, Raman, and cyclic voltammogram measurement results.

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Synthesis of nitrogen-doped carbon microtubes for application in lithium batteries

Cited by 14 publications

References 21 publications

Electron Transport through Early Exponential‐Phase Anode‐Grown Geobacter sulfurreducens Biofilms

Electron Transport through Early Exponential‐Phase Anode‐Grown Geobacter sulfurreducens Biofilms

Carbon‐Based Materials for Lithium‐Ion Batteries, Electrochemical Capacitors, and Their Hybrid Devices

Unusual increase in the electric double-layer capacitance with charge–discharge cycles of nitrogen doped single-walled carbon nanotubes

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